cmux-next: onboarding and Accounts show labels and actions only

[teamleaderleo]

Leo's labels-and-actions rule (2026-10-06), routed to this lane by the coordinator while the onboarding lanes are idle.

What changes

• Onboarding, Accounts: the subtitle "Sign-ins cmux found on this Mac. Nothing is uploaded unless you choose Connect." is gone.

• Onboarding, Import from Browsers: "Each profile becomes a cmux profile. Nothing leaves this Mac." is gone.

• CodeRouter unreachable (onboarding and Settings > Accounts): no more "CodeRouter accounts are unavailable: …" line. Connect links an account into CodeRouter, so it now hides while CodeRouter can't be reached (AccountRowState.canConnect, and the Settings row and page buttons). It comes back when CodeRouter loads again.

• Settings > Accounts: the intro "cmux checks this Mac for sign-ins and keys. …" is gone too (same screen, same rule). Refresh stays at the trailing edge.

• Onboarding, Import: the note "macOS asks before cmux reads each browser's sign-ins." is gone (seen on the after build's capture).

• Settings > Accounts rows: Connect appears only when it can run (signed in to cmux, CodeRouter reachable, a routable provider) instead of sitting greyed out. "CodeRouter does not route this provider yet." is gone from the rows; the CLI still returns it when a connect is refused.

• The two gallery-only variants that reused the removed onboarding subtitles drop the line as well. Dead strings are removed from the catalogs.

• The Settings page bundle is regenerated. It also picks up feat(cmux-next): add live app interface scale #17539's "Interface Scale" string, which was missing from the committed locales.

• Settings > Accounts, signed out: one "Sign In to cmux" button at the top of Accounts, leading the Refresh row. The banner sentence "Sign in to cmux to connect accounts to CodeRouter, so cmux agents and Cloud machines can use them." is gone, and so is Connect's tooltip that repeated it. The page state carries only the button title (signIn: String?).

Tests

• OnboardingNoProseTests renders the default Accounts and Import screens and checks that none of the removed sentences are shown.
• CredentialAndRowTests.connectHidesWhileCodeRouterIsUnreachable: Connect is unavailable after linkedFailed and returns after linkedLoaded.
• AccountsModelTests.signedOutIsOneSignInButton: the encoded signed-out page carries the button title and no CodeRouter sentence.
• AccountsModelTests.rowsOfferOnlyWhatCanRun: signed out, no row has Connect and none says "does not route".
• OnboardingNoProseTests also covers the Import sign-ins note.

Red commits (tests only): a7a48b9, 5fcd66c, 47aae12, 2c15424. Green: 9a8080f, a9902bd, eec02eb, and the Connect/row fix.

Captures

Fleet DEV builds on a capture mini. "Before" for onboarding is feat-cmux-next 70fb440 (same mini session as #17553). The Settings "before" is this PR's intermediate build, which already had the intro and banner cut; it still showed greyed Connect buttons and "CodeRouter does not route this provider yet." "After" is this PR's head (onbprose-after3). The mini isn't signed in to cmux, so Settings shows the signed-out state.

	Before	After
Onboarding: Accounts
Onboarding: Import
Settings > Accounts (signed out)

Changelog

• Changed: cmux-next onboarding and Settings > Accounts drop explanatory lines; signed out shows one Sign In to cmux button; Connect hides while CodeRouter is unreachable.

🤖 Generated with Claude Code

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[github-actions]

Not verified: macOS jobs did not run: compile and app tests were skipped on 5ec5c2963c; ci-status is green without them.

CI passes on 5ec5c2963c (run 37498848823 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way.

[teamleaderleo]

Batch queue: green. Batch stack 585c7c73df5a on feat-cmux-next b7cd157736d2 with #17534 #17537 #17551 #17552 #17556 #17582 #17583 #17588 #17590. Fleet production build: job 4a08261515853623d652f844 (cmux-ci artifact 4a08261515853623d652f844 (job 4a08261515853623d652f844, tag nb-local-20261006-162817-1)). heavy tier did not run on this branch (run); your PR's own checks are the tests. Validated this PR at 6870ce79fb23.

Next: land it yourself with gh-merge-green on this receipt.

[teamleaderleo]

merge-override: Fast checks green with the new tests executed; only the heavy same-tree cmux-tui wait job is still running

[teamleaderleo]

merge-override: Fast checks green on 5ec5c29 with the new tests executed; only the heavy same-tree cmux-tui wait job is still running